Fix installation of ports that rely on cp -n for installing files. r245960
changed cp to exit with a non-zero exit code if the file exists and is not
overwritten thus causing ports to fail installing when e.g. trying to cp
.default -> .conf files that already exist.
We just ignore the error and continue, as we used to.
Reported by: jaset
Approved by: portmgr (bapt)

Two new patches have been released, one resolves compiler issues on x86-64
architectures, the other fixes a critical problem that causes the program to
use 100% of the CPU. Both added them to the port.
PR: ports/99596
Submitted by: maintainer